/**
 * Copyright (c) 2007-2008 Nearchos Paspallis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * AspectSense
 *
 * Middleware for annotation-based, context-aware and adaptive services for
 * mobile and ubiquitous computing
 *
 * This project is an open-source effort, initiated by Nearchos Paspallis as
 * part of his PhD work at the University of Cyprus (http://www.ucy.ac.cy).
 *
 * More information about the project is available at "http://aspectsense.org".
 */

package org.aspectsense.example_apps.helloworld;

import org.aspectsense.framework.DefaultComponent;
import org.aspectsense.annotations.RequiredService;
import org.aspectsense.annotations.Component;
import org.aspectsense.annotations.Service;
import org.aspectsense.annotations.ServiceUtility;

/**
 * @author Nearchos Paspallis [nearchos@cs.ucy.ac.cy]
 *         Date: Feb 20, 2008
 *         Time: 3:34:01 PM
 */
@Component(
        displayID = "Hello world",
        description = "The end-user component of the Hello World example"
)
@Service(
        serviceType = HelloWorld.class
)
@ServiceUtility(
        targetServiceType = HelloWorld.class,
        utilityFunction = "utility[org.aspectsense.example_apps.helloworld.UI]"
)
public class HelloWorldImpl
        extends DefaultComponent
        implements HelloWorld, Runnable
{
    @RequiredService(
            variationPointID = "UI variation point"
    )
    private UI ui;

    public HelloWorldImpl()
    {
        super();
    }

    public void init()
    {
        super.init();
    }

    private boolean activated = false;

    public void activate()
    {
        super.activate();

        activated = true;
        new Thread(this).start();
    }

    public void suspend()
    {
        activated = false;

        super.suspend();
    }

    public static final long SLEEP_PERIOD = 1000L; // 1sec

    public void run()
    {
        while(activated)
        {
            ui.communicateText("Hello World!");

            try
            {
                Thread.sleep(SLEEP_PERIOD);
            }
            catch (InterruptedException ie)
            {
                System.err.println("Thread interrupted: " + ie.getMessage());
            }
        }
    }
}